November 3, 2018 is a Saturday. The NYSE updates the NYXBT on weekdays, so the contest will presumably be decided on Friday 2 November 2018. If the NYXBT no longer provides a clear value, the top result of a Google search for 1 bitcoin in USD will be used.

Users can modify their predictions up to the deadline, after which I'll compile a table of predictions expressed in USD. I'll do my best conversion for troublemakers like steve who use alternate units, but guesses denominated in satoshis will be disqualified.

If you want to avoid sniping, you can obscure your guess as a SHA256 hash. Enter some text like

wasoxygen guesses $10,000

and post a hash like

9306FEA2E84D5AA03CF50DFB1DF2AD1778FC140727A22421E25148DAF574A1C0

then, after the deadline, share the exact text that produces that hash and I'll update your guess.

30 November 2017 update:

Here are the official predictions. I added blackbootz (and also seconded his guess) and switched steve back to ETH.